If you are talking about the alignment cams, they are replaceable without the control arm assembly and can be purchased at the dealer. It is very common for them to seize. If you also need new control arms, they can also be purchased at the dealer but are very $$$ as they include the ball joint.

No aftermarket alternatives at this point in time - dealer only. If you aren't in a rush, try one of the site vendors as you'll save a few bucks.